A steel oil pumping rod resistant to bending fatigue and its processing technology

Abstract

A steel oil pumping rod resistant to bending fatigue, comprising an upsetting end, a rod body, a bending fatigue resistant round rod section and a closed end, the rod body and the bending fatigue resistant round rod section are connected by a welding process, the The closed end and the bending fatigue-resistant round rod section are connected by welding; the processing technology includes the processing of the carrier body of the bending fatigue-resistant round rod section, the processing of the bending fatigue-resistant body, and the self-propagating high temperature of the bending fatigue-resistant round rod section. Synthetic welding processing, friction welding processing, weld localization heat treatment and surface mechanical polishing treatment. The bending fatigue-resistant steel oil pumping polished rod in the present invention is specially aimed at the high-proportion fracture area under the action of bending fatigue within 10 cm below the polished rod clip and its influence range, and introduces a composite structure of spring steel, which has excellent bending fatigue resistance and can effectively Solve the fracture problem of the oil pumping rod and prolong the service life of the oil pumping rod.

Description

technical field [0001] The invention relates to components in the field of oil extraction, and more particularly relates to a steel oil pumping polished rod resistant to bending fatigue and a processing technology thereof. Background technique [0002] As a key rod in the oil production part of the rod pump, the mechanical properties of the oil pumping rod are very important, among which fatigue fracture is the most important failure mode, and its fatigue performance is the key that directly affects the service life of the oil pumping rod and the normal oil production of the oil field. performance. [0003] The solution to the problem of polished rod fracture has always been a difficult problem in the industry, especially under the superposition of multiple stresses, its fatigue fracture is even more difficult to effectively solve. For the polished rod, in addition to the tension alternating stress, there is a serious superposition of bending alternating stress in the range...

AI Technical Summary

Problems solved by technology

Among the existing improved products, BZ11, FG20 and other material-type oil pumping rods are gradually abandoned due to high cost, difficult processing, and performance stability problems.

The current problem is how to develop a polished oil rod with excellent toughness and bending resistance, which can effectively improve the fatigue performance under the superimposed action of bending fatigue stress, and effectively solve the problem of artificial lifting in oil fields. The problem of polished rod breakage in oil production ensures efficient and normal operation of oil wells

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